2018
Optical feedback tweezers
Kumar A, Bechhoefer J. Optical feedback tweezers. 2018, 10723: 107232j. DOI: 10.1117/12.2323837.Peer-Reviewed Original ResearchFeedback trapOptical trapAcoustooptic deflectorTime-shared optical tweezersDouble-well potentialVirtual potentialOptical tweezersLaser powerPosition detectorTrap positionBarrier heightParticle positionsArbitrary potentialTweezersObserved fluctuationsTrapsParticlesWell separationIndependent controlDeflectorLoop rateDetectorPreliminary experimentsHydrodynamic forcesFeedback force
2016
Simultaneous measurement of mass and rotation of trapped absorbing particles in air.
Bera S, Kumar A, Sil S, Saha T, Saha T, Banerjee A. Simultaneous measurement of mass and rotation of trapped absorbing particles in air. Optics Letters 2016, 41: 4356-9. PMID: 27628396, DOI: 10.1364/ol.41.004356.Peer-Reviewed Original ResearchSpectral densityPhotophoretic forceVelocity autocorrelation functionLaser powerRotation frequencyParticle massMean squared displacementPower spectral densityResonance frequencySpontaneous rotationLangevin equationSimultaneous measurementBody forceClear peakParticle clustersAutocorrelation functionSquared displacementReasonable accuracyBrownian motionDensityParticlesBeamRotationAirAnalytical functions